Production of strip steel



Jan. 21, 1930. H. P. PARROCK 1,744,670

PRODUCTION OF STR IP STEEL Filed March 18, 1927 gwue'ntoz Q Q 122B l dz'i'aii Patented Jan. 21, 1930 UNITED STATES PATENT OFFICE PRODUCTION OF STRIP STEEL Application flledlarch 18, 1927. Serial No. 176,885.

My invention relates to the production of strip steel. The present method of makin strip steel consists in rolling a suitable sla or bar into heavy strips while hot, in a continuous mill to as low a gauge as may he demanded, within the limits of the process. To make light strips, the strips so produced are cold rolled down to light gauges. Or, by

the purpose of producing narrow strip widths.

In producing strips according to my invention, I take stock in the form of long strips,

5 for example 120 feet long by 16 inches wide by 3- of an inch thick, heated to a dull red heat either by reheating a coil in a suitable furnace or as it comes from the finishing pass of the heavy mill, and fold itlengthwise either by a plain fold or any other suitable fold, to provide for instance, an eight ply fold, each ply being 2 inches wide. The folded stock is sheared when cold along its edges and the strips separated and coiled.

In the accompanying drawing I have disclosed an, arrangement of apparatus which may be used for accomplishing the desired result althoughit is apparent to those skilled in the art that other equally efiicient means might be devised for accomplishing the same result.

Referring now to the drawings: Fig. 1 is a perspective view ofa portion 5 of a sheet of marked or grooved stock preparatory to rolling;

Fig. 2 is an elevation of thefirst pass of rolls, the sheet being shown in section.

Fig. 3 is a similar view of the rolls f0 1 tlie second pass. Y

These methods however are moreexpensive than the method I propose when used for ing mill and be rolled down to thedesired Fig. 4 is a similar View of the rolls for the third pass.

Fig. 5' shows in section a four ply folded strip.

Fig. 6 shows a machine for shearing" the ed es of the folded strip.

ig. 7 shows the coiling device.

The sheet 1 before being fed to the foldingrolls is first marked or grooved, as at 2, longitudinally on either one or both sides, for the purpose of facilitating folding and to reduce buckling when coiling a multiple ply strip. This can be done on the last pass of the heavy stock mill, or on the feed rolls serving the folding machine. In ordinary work, the latter method is the simpler.

The sheet as it is fedto the No. 1 pass of the rolls is hot and is preliminarily bent as shown by the rolls 3 and 3, the concave surface of one roll coacting with the convexsur- 7 face of the other. From the No. 1 pass, the sheet is continuously fed forward to the angle rolls. 4 and 4, the sheet as it leaves these rolls being about half way folded. After leaving the angle rolls 4 and 4 the sheet 75. e

is continuously fed between the vertical squeeze rolls 5, wherein the first ply of the fold is completed, the metal sheet having been bent flat along the line 2.

If all that it is desired to make is a two ply fold then the sheet may proceed directly to the shears or to a coiling mechanism as hereinafter described. If it is desired to make a four lply fold then the sheet may go through anot er series of folding operations similar to that just described. In fact there can be as many repetitions of folding as is within the possibilities of the stock being worked upon. While the rolls are shown in a horizontal position they are equally oper able in the vertical position.

After the sheet has'been folded into as many ply as desired, it may then pass directly while still hot into a continuous rollgauge or it may berecoiled for use in the trade or for future-rolling. The temperature of rolling is such that .stickin of ye does not take lace, as in the -ol er s eet mill process. e metal is also rolled down much on a cold mill, sin V The folded sheet when cold may thereafter be fed to a shearing machine of any suitable type such as is shown in Fig. 7 wherein there is a loweryroll'fi-coactin with an upper roll 7, which shears off the olded edges 8 of the strip pile 9. a I

Inasmuch as the metal is sheared after the final pass through the rolls, it does not have the rag ed edges of cold rolled strip, which neralfi must be sheared on the edges after al rolling.

The superposed plies of strips from the shearing operation are fed between pinch or squeeze rolls 10 which guide and feed the stock and also break or start the plys more rapidly in plly than it could be done on each other to loosen them and to relleve es heavier stocks, it will sometimes lie necessary to reheat, but my method is still less expensive than single cold rolling, with res ect to power, strength of mill and speed 0 reduction. Furthermore cold rolled strip does not have the soft properties of hot rolled stock, unless annealed.

much faster in rolling, in a given mill than rolling single sheets. By rolling in a pack the heat is conserved more than in a single sheet on account of the relatively less radiating surface. This means that the stock can be worked on that much longer before it cools than is the case of single strip rolling.

If comparison is made with cold rolling, which must be done in single strips underv known methods, the method of rolling in multiple plys is evidently less expensive. The cold mill in order to produce the light gauges, must intermittently anneal to relieve strain. in hot rolling in folds, strains are notset up as in cold rolling.

From the above description it will be clear that I take a long strip of metal of standard specifications heated to the temperature be low the sticking point of the plys to each other as in old fashioned sheet practice and fold 'it lengthwise into as many folds as desired and thereafter further reduce the gauge by rolling whilehot. The metal may then be rolled into a coil for future use or it may be passed through a shearing machine to cut the edges of the fold, the separate strips then be ing coiled in their final condition.

While Ihave described and illustrated my invention in connection with apparatusfor making a simple fold, it is within the s irit of my invention that other methods an ap- 1ng rolls while hot, therea By folding the stock, it can be reduced paratus for folding in other ways may be employed.

I therefore desire the present embodiment to be considered as illustrative and not-restrictive,referencebein had to the ap ended claims rather than to t e foregoing escrip- 'tion to indicate the scope of the invention.

which comprises progressively folding a long strip lengthwise and reducing the gauge of it while hot and thereafter cutting thefolded o strip along its edges to separate the plies of g the fold.

2 The methodv ofproducing strip steel which comprises the steps of pro essively folding'alon strip lengthwise, re ucing the 35 gaugebyrol 'ng while hot and cutting it lengthwise to roduce a plurality of strips.

3. The met 0d of producing stri steel which com rises folding'a longstrip lengthwise by forming and gauge reducing rolls while hot and cutting it lengthwise to produce a plurality of strips.

4. The method of producing stri which com rises folding along strip l; wise by fee ing it continuousl through formr further reducing the gauge by rolling and cutting it lengthwise to roduce a plurality of strips.

5. The met 0d of producing stri hich comprises folding a long strip lengthwise while hot by feeding it continuously through forming rolls, thereafter further reducing the gauge b rolling while hot and steel then cutting the fol ed stri along its edges 105 to separate the plies of the old.

The method of producing stri which comprises folding a long strip l e wise and reducing the gau e by rolllng steel n' hw ile hot, thereafter cutting, while cold, the folded 110 squeeze rolls to facilitate separating the lies and thereafter separately coiling each p y.

8. The method of producin strip metal which comprises progressively olding a long strip along its longitudinal axis, pro 'vely rolling the'folded str' to reduce t e gauge 125 and thereafter cuttin t e folded strip along its edges to se arate t e plies of the fold. a

9. The met 0d of producing strip metal which comprises progressively folding and rolling a long strip along its longitudinal ceding it continuously through 00 ngthsteel steel 11 axis toreduce its gauge by feeding it continuously between rolls and thereafter cutting the folded strip along its edges to separate the plies of the "fold. 10. Tho method of producing strip metal which comprises progressively folding and rolling strip stock to reduce its auge and cutting it lengthwise to produce a. p urality of strips.

HARRY P. PARROCK 

